#include <config.h>
#include <limits.h>
#include <fcntl.h>
-#include <stdio.h>
+#include "sysstdio.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <selinux/context.h>
#endif
-#ifdef HAVE_POSIX_ACL
+#ifdef HAVE_ACL_SET_FILE
#include <sys/acl.h>
#endif
#ifdef WINDOWSNT
#define NOMINMAX 1
#include <windows.h>
-#include <fcntl.h>
#include <sys/file.h>
#include "w32.h"
#endif /* not WINDOWSNT */
#ifdef MSDOS
#include "msdos.h"
#include <sys/param.h>
-#include <fcntl.h>
#endif
#ifdef DOS_NT
#endif
#include "systime.h"
+#include <acl.h>
#include <allocator.h>
#include <careadlinkat.h>
#include <stat-time.h>
#ifdef WINDOWSNT
#endif
-Lisp_Object Qfile_error;
+Lisp_Object Qfile_error, Qfile_notify_error;
static Lisp_Object Qfile_already_exists, Qfile_date_error;
static Lisp_Object Qexcl;
Lisp_Object Qfile_name_history;
struct coding_system *);
\f
+/* Signal a file-access failure. STRING describes the failure,
+ NAME the file involved, and ERRORNO the errno value.
+
+ If NAME is neither null nor a pair, package it up as a singleton
+ list before reporting it; this saves report_file_errno's caller the
+ trouble of preserving errno before calling list1. */
+
void
-report_file_error (const char *string, Lisp_Object data)
+report_file_errno (char const *string, Lisp_Object name, int errorno)
{
+ Lisp_Object data = CONSP (name) || NILP (name) ? name : list1 (name);
Lisp_Object errstring;
- int errorno = errno;
char *str;
synchronize_system_messages_locale ();
}
}
-Lisp_Object
-close_file_unwind (Lisp_Object fd)
+/* Signal a file-access failure that set errno. STRING describes the
+ failure, NAME the file involved. When invoking this function, take
+ care to not use arguments such as build_string ("foo") that involve
+ side effects that may set errno. */
+
+void
+report_file_error (char const *string, Lisp_Object name)
{
- emacs_close (XFASTINT (fd));
- return Qnil;
+ report_file_errno (string, name, errno);
+}
+
+void
+close_file_unwind (int fd)
+{
+ emacs_close (fd);
+}
+
+void
+fclose_unwind (void *arg)
+{
+ FILE *stream = arg;
+ fclose (stream);
}
/* Restore point, having saved it as a marker. */
-Lisp_Object
+void
restore_point_unwind (Lisp_Object location)
{
Fgoto_char (location);
Fset_marker (location, Qnil, Qnil);
- return Qnil;
}
\f
}
#ifdef DOS_NT
- beg = alloca (SBYTES (filename) + 1);
- memcpy (beg, SSDATA (filename), SBYTES (filename) + 1);
+ beg = xlispstrdupa (filename);
#else
beg = SSDATA (filename);
#endif
return Ffile_name_directory (filename);
}
+/* Maximum number of bytes that DST will be longer than SRC
+ in file_name_as_directory. This occurs when SRCLEN == 0. */
+enum { file_name_as_directory_slop = 2 };
+
/* Convert from file name SRC of length SRCLEN to directory name in
DST. MULTIBYTE non-zero means the file name in SRC is a multibyte
string. On UNIX, just make sure there is a terminating /. Return
return 2;
}
- strcpy (dst, src);
-
+ memcpy (dst, src, srclen);
if (!IS_DIRECTORY_SEP (dst[srclen - 1]))
- {
- dst[srclen] = DIRECTORY_SEP;
- dst[srclen + 1] = '\0';
- srclen++;
- }
+ dst[srclen++] = DIRECTORY_SEP;
+ dst[srclen] = 0;
#ifdef DOS_NT
dostounix_filename (dst, multibyte);
#endif
{
char *buf;
ptrdiff_t length;
- Lisp_Object handler;
+ Lisp_Object handler, val;
+ USE_SAFE_ALLOCA;
CHECK_STRING (file);
if (NILP (file))
if (!NILP (Vw32_downcase_file_names))
file = Fdowncase (file);
#endif
- buf = alloca (SBYTES (file) + 10);
+ buf = SAFE_ALLOCA (SBYTES (file) + file_name_as_directory_slop + 1);
length = file_name_as_directory (buf, SSDATA (file), SBYTES (file),
STRING_MULTIBYTE (file));
- return make_specified_string (buf, -1, length, STRING_MULTIBYTE (file));
+ val = make_specified_string (buf, -1, length, STRING_MULTIBYTE (file));
+ SAFE_FREE ();
+ return val;
}
\f
/* Convert from directory name SRC of length SRCLEN to file name in
directory_file_name (char *dst, char *src, ptrdiff_t srclen, bool multibyte)
{
/* Process as Unix format: just remove any final slash.
- But leave "/" unchanged; do not change it to "". */
- strcpy (dst, src);
- if (srclen > 1
- && IS_DIRECTORY_SEP (dst[srclen - 1])
+ But leave "/" and "//" unchanged. */
+ while (srclen > 1
#ifdef DOS_NT
- && !IS_ANY_SEP (dst[srclen - 2])
+ && !IS_ANY_SEP (src[srclen - 2])
#endif
- )
- {
- dst[srclen - 1] = 0;
- srclen--;
- }
+ && IS_DIRECTORY_SEP (src[srclen - 1])
+ && ! (srclen == 2 && IS_DIRECTORY_SEP (src[0])))
+ srclen--;
+
+ memcpy (dst, src, srclen);
+ dst[srclen] = 0;
#ifdef DOS_NT
dostounix_filename (dst, multibyte);
#endif
{
char *buf;
ptrdiff_t length;
- Lisp_Object handler;
+ Lisp_Object handler, val;
+ USE_SAFE_ALLOCA;
CHECK_STRING (directory);
if (!NILP (Vw32_downcase_file_names))
directory = Fdowncase (directory);
#endif
- buf = alloca (SBYTES (directory) + 20);
+ buf = SAFE_ALLOCA (SBYTES (directory) + 1);
length = directory_file_name (buf, SSDATA (directory), SBYTES (directory),
STRING_MULTIBYTE (directory));
- return make_specified_string (buf, -1, length, STRING_MULTIBYTE (directory));
+ val = make_specified_string (buf, -1, length, STRING_MULTIBYTE (directory));
+ SAFE_FREE ();
+ return val;
}
static const char make_temp_name_tbl[64] =
dog-slow, but also useless since eventually nil would
have to be returned anyway. */
report_file_error ("Cannot create temporary name for prefix",
- Fcons (prefix, Qnil));
+ prefix);
/* not reached */
}
}
DEFUN ("expand-file-name", Fexpand_file_name, Sexpand_file_name, 1, 2, 0,
doc: /* Convert filename NAME to absolute, and canonicalize it.
Second arg DEFAULT-DIRECTORY is directory to start with if NAME is relative
-\(does not start with slash or tilde); if DEFAULT-DIRECTORY is nil or missing,
-the current buffer's value of `default-directory' is used.
+\(does not start with slash or tilde); both the directory name and
+a directory's file name are accepted. If DEFAULT-DIRECTORY is nil or
+missing, the current buffer's value of `default-directory' is used.
NAME should be a string that is a valid file name for the underlying
filesystem.
File name components that are `.' are removed, and
Lisp_Object handler, result, handled_name;
bool multibyte;
Lisp_Object hdir;
+ USE_SAFE_ALLOCA;
CHECK_STRING (name);
#endif
/* Make a local copy of nm[] to protect it from GC in DECODE_FILE below. */
- nm = alloca (SBYTES (name) + 1);
- memcpy (nm, SSDATA (name), SBYTES (name) + 1);
+ nm = xlispstrdupa (name);
#ifdef DOS_NT
/* Note if special escape prefix is present, but remove for now. */
|| (p[2] == '.' && (IS_DIRECTORY_SEP (p[3])
|| p[3] == 0))))
lose = 1;
- /* We want to replace multiple `/' in a row with a single
- slash. */
- else if (p > nm
- && IS_DIRECTORY_SEP (p[0])
- && IS_DIRECTORY_SEP (p[1]))
+ /* Replace multiple slashes with a single one, except
+ leave leading "//" alone. */
+ else if (IS_DIRECTORY_SEP (p[0])
+ && IS_DIRECTORY_SEP (p[1])
+ && (p != nm || IS_DIRECTORY_SEP (p[2])))
lose = 1;
p++;
}
else /* ~user/filename */
{
char *o, *p;
- for (p = nm; *p && (!IS_DIRECTORY_SEP (*p)); p++);
- o = alloca (p - nm + 1);
+ for (p = nm; *p && !IS_DIRECTORY_SEP (*p); p++)
+ continue;
+ o = SAFE_ALLOCA (p - nm + 1);
memcpy (o, nm, p - nm);
- o [p - nm] = 0;
+ o[p - nm] = 0;
block_input ();
pw = getpwnam (o + 1);
if (!IS_DIRECTORY_SEP (nm[0]))
{
ptrdiff_t newlen = strlen (newdir);
- char *tmp = alloca (newlen + strlen (nm) + 2);
+ char *tmp = alloca (newlen + file_name_as_directory_slop
+ + strlen (nm) + 1);
file_name_as_directory (tmp, newdir, newlen, multibyte);
strcat (tmp, nm);
nm = tmp;
if (newdir)
{
- /* Get rid of any slash at the end of newdir, unless newdir is
- just / or // (an incomplete UNC name). */
+ /* Ignore any slash at the end of newdir, unless newdir is
+ just "/" or "//". */
length = strlen (newdir);
- tlen = length + 1;
- if (length > 1 && IS_DIRECTORY_SEP (newdir[length - 1])
-#ifdef WINDOWSNT
- && !(length == 2 && IS_DIRECTORY_SEP (newdir[0]))
-#endif
- )
- {
- char *temp = alloca (length);
- memcpy (temp, newdir, length - 1);
- temp[length - 1] = 0;
- length--;
- newdir = temp;
- }
+ while (length > 1 && IS_DIRECTORY_SEP (newdir[length - 1])
+ && ! (length == 2 && IS_DIRECTORY_SEP (newdir[0])))
+ length--;
}
else
- {
- length = 0;
- tlen = 0;
- }
+ length = 0;
/* Now concatenate the directory and name to new space in the stack frame. */
- tlen += strlen (nm) + 1;
+ tlen = length + file_name_as_directory_slop + strlen (nm) + 1;
#ifdef DOS_NT
/* Reserve space for drive specifier and escape prefix, since either
or both may need to be inserted. (The Microsoft x86 compiler
target = alloca (tlen + 4);
target += 4;
#else /* not DOS_NT */
- target = alloca (tlen);
+ target = SAFE_ALLOCA (tlen);
#endif /* not DOS_NT */
*target = 0;
if (!(drive && nm[0] && IS_DIRECTORY_SEP (newdir[0])
&& newdir[1] == '\0'))
#endif
- strcpy (target, newdir);
+ {
+ memcpy (target, newdir, length);
+ target[length] = 0;
+ }
}
else
file_name_as_directory (target, newdir, length, multibyte);
++o;
p += 3;
}
- else if (p > target && IS_DIRECTORY_SEP (p[1]))
- /* Collapse multiple `/' in a row. */
+ else if (IS_DIRECTORY_SEP (p[1])
+ && (p != target || IS_DIRECTORY_SEP (p[2])))
+ /* Collapse multiple "/", except leave leading "//" alone. */
p++;
else
{
{
handled_name = call3 (handler, Qexpand_file_name,
result, default_directory);
- if (STRINGP (handled_name))
- return handled_name;
- error ("Invalid handler in `file-name-handler-alist'");
+ if (! STRINGP (handled_name))
+ error ("Invalid handler in `file-name-handler-alist'");
+ result = handled_name;
}
+ SAFE_FREE ();
return result;
}
/* Always work on a copy of the string, in case GC happens during
decode of environment variables, causing the original Lisp_String
data to be relocated. */
- nm = alloca (SBYTES (filename) + 1);
- memcpy (nm, SDATA (filename), SBYTES (filename) + 1);
+ nm = xlispstrdupa (filename);
#ifdef DOS_NT
dostounix_filename (nm, multibyte);
security_context_t con;
int conlength = 0;
#endif
-#ifdef HAVE_POSIX_ACL
+#ifdef WINDOWSNT
acl_t acl = NULL;
#endif
#ifdef WINDOWSNT
if (!NILP (preserve_extended_attributes))
{
-#ifdef HAVE_POSIX_ACL
acl = acl_get_file (SDATA (encoded_file), ACL_TYPE_ACCESS);
- if (acl == NULL && errno != ENOTSUP)
- report_file_error ("Getting ACL", Fcons (file, Qnil));
-#endif
+ if (acl == NULL && acl_errno_valid (errno))
+ report_file_error ("Getting ACL", file);
}
if (!CopyFile (SDATA (encoded_file),
SDATA (encoded_newname),
{
/* CopyFile doesn't set errno when it fails. By far the most
"popular" reason is that the target is read-only. */
- if (GetLastError () == 5)
- errno = EACCES;
- else
- errno = EPERM;
- report_file_error ("Copying file", Fcons (file, Fcons (newname, Qnil)));
+ report_file_errno ("Copying file", list2 (file, newname),
+ GetLastError () == 5 ? EACCES : EPERM);
}
/* CopyFile retains the timestamp by default. */
else if (NILP (keep_time))
/* Restore original attributes. */
SetFileAttributes (filename, attributes);
}
-#ifdef HAVE_POSIX_ACL
if (acl != NULL)
{
bool fail =
acl_set_file (SDATA (encoded_newname), ACL_TYPE_ACCESS, acl) != 0;
- if (fail && errno != ENOTSUP)
- report_file_error ("Setting ACL", Fcons (newname, Qnil));
+ if (fail && acl_errno_valid (errno))
+ report_file_error ("Setting ACL", newname);
acl_free (acl);
}
-#endif
#else /* not WINDOWSNT */
immediate_quit = 1;
ifd = emacs_open (SSDATA (encoded_file), O_RDONLY, 0);
immediate_quit = 0;
if (ifd < 0)
- report_file_error ("Opening input file", Fcons (file, Qnil));
+ report_file_error ("Opening input file", file);
- record_unwind_protect (close_file_unwind, make_number (ifd));
+ record_unwind_protect_int (close_file_unwind, ifd);
if (fstat (ifd, &st) != 0)
- report_file_error ("Input file status", Fcons (file, Qnil));
+ report_file_error ("Input file status", file);
if (!NILP (preserve_extended_attributes))
{
{
conlength = fgetfilecon (ifd, &con);
if (conlength == -1)
- report_file_error ("Doing fgetfilecon", Fcons (file, Qnil));
+ report_file_error ("Doing fgetfilecon", file);
}
#endif
-
-#ifdef HAVE_POSIX_ACL
- acl = acl_get_fd (ifd);
- if (acl == NULL && errno != ENOTSUP)
- report_file_error ("Getting ACL", Fcons (file, Qnil));
-#endif
}
if (out_st.st_mode != 0
&& st.st_dev == out_st.st_dev && st.st_ino == out_st.st_ino)
- {
- errno = 0;
- report_file_error ("Input and output files are the same",
- Fcons (file, Fcons (newname, Qnil)));
- }
+ report_file_errno ("Input and output files are the same",
+ list2 (file, newname), 0);
/* We can copy only regular files. */
if (!S_ISREG (st.st_mode))
- {
- /* Get a better looking error message. */
- errno = S_ISDIR (st.st_mode) ? EISDIR : EINVAL;
- report_file_error ("Non-regular file", Fcons (file, Qnil));
- }
+ report_file_errno ("Non-regular file", file,
+ S_ISDIR (st.st_mode) ? EISDIR : EINVAL);
-#ifdef MSDOS
- /* System's default file type was set to binary by _fmode in emacs.c. */
- ofd = emacs_open (SDATA (encoded_newname),
- O_WRONLY | O_TRUNC | O_CREAT
- | (NILP (ok_if_already_exists) ? O_EXCL : 0),
- S_IREAD | S_IWRITE);
-#else /* not MSDOS */
{
- mode_t new_mask = !NILP (preserve_uid_gid) ? 0600 : 0666;
- new_mask &= st.st_mode;
+#ifndef MSDOS
+ int new_mask = st.st_mode & (!NILP (preserve_uid_gid) ? 0600 : 0666);
+#else
+ int new_mask = S_IREAD | S_IWRITE;
+#endif
ofd = emacs_open (SSDATA (encoded_newname),
(O_WRONLY | O_TRUNC | O_CREAT
| (NILP (ok_if_already_exists) ? O_EXCL : 0)),
new_mask);
}
-#endif /* not MSDOS */
if (ofd < 0)
- report_file_error ("Opening output file", Fcons (newname, Qnil));
+ report_file_error ("Opening output file", newname);
- record_unwind_protect (close_file_unwind, make_number (ofd));
+ record_unwind_protect_int (close_file_unwind, ofd);
immediate_quit = 1;
QUIT;
while ((n = emacs_read (ifd, buf, sizeof buf)) > 0)
- if (emacs_write (ofd, buf, n) != n)
- report_file_error ("I/O error", Fcons (newname, Qnil));
+ if (emacs_write_sig (ofd, buf, n) != n)
+ report_file_error ("Write error", newname);
immediate_quit = 0;
#ifndef MSDOS
- /* Preserve the original file modes, and if requested, also its
+ /* Preserve the original file permissions, and if requested, also its
owner and group. */
{
mode_t mode_mask = 07777;
mode_mask |= 02000;
}
}
- if (fchmod (ofd, st.st_mode & mode_mask) != 0)
- report_file_error ("Doing chmod", Fcons (newname, Qnil));
+
+ switch (!NILP (preserve_extended_attributes)
+ ? qcopy_acl (SSDATA (encoded_file), ifd,
+ SSDATA (encoded_newname), ofd,
+ st.st_mode & mode_mask)
+ : fchmod (ofd, st.st_mode & mode_mask))
+ {
+ case -2: report_file_error ("Copying permissions from", file);
+ case -1: report_file_error ("Copying permissions to", newname);
+ }
}
#endif /* not MSDOS */
bool fail = fsetfilecon (ofd, con) != 0;
/* See http://debbugs.gnu.org/11245 for ENOTSUP. */
if (fail && errno != ENOTSUP)
- report_file_error ("Doing fsetfilecon", Fcons (newname, Qnil));
+ report_file_error ("Doing fsetfilecon", newname);
freecon (con);
}
#endif
-#ifdef HAVE_POSIX_ACL
- if (acl != NULL)
- {
- bool fail = acl_set_fd (ofd, acl) != 0;
- if (fail && errno != ENOTSUP)
- report_file_error ("Setting ACL", Fcons (newname, Qnil));
-
- acl_free (acl);
- }
-#endif
-
if (!NILP (keep_time))
{
EMACS_TIME atime = get_stat_atime (&st);
}
if (emacs_close (ofd) < 0)
- report_file_error ("I/O error", Fcons (newname, Qnil));
+ report_file_error ("Write error", newname);
emacs_close (ifd);
#else
if (mkdir (dir, 0777 & ~auto_saving_dir_umask) != 0)
#endif
- report_file_error ("Creating directory", list1 (directory));
+ report_file_error ("Creating directory", directory);
return Qnil;
}
dir = SSDATA (encoded_dir);
if (rmdir (dir) != 0)
- report_file_error ("Removing directory", list1 (directory));
+ report_file_error ("Removing directory", directory);
return Qnil;
}
encoded_file = ENCODE_FILE (filename);
if (unlink (SSDATA (encoded_file)) < 0)
- report_file_error ("Removing old name", list1 (filename));
+ report_file_error ("Removing old name", filename);
return Qnil;
}
INTEGERP (ok_if_already_exists), 0, 0);
if (rename (SSDATA (encoded_file), SSDATA (encoded_newname)) < 0)
{
- if (errno == EXDEV)
+ int rename_errno = errno;
+ if (rename_errno == EXDEV)
{
ptrdiff_t count;
symlink_target = Ffile_symlink_p (file);
unbind_to (count, Qnil);
}
else
- report_file_error ("Renaming", list2 (file, newname));
+ report_file_errno ("Renaming", list2 (file, newname), rename_errno);
}
UNGCPRO;
return Qnil;
unlink (SSDATA (newname));
if (link (SSDATA (encoded_file), SSDATA (encoded_newname)) < 0)
- report_file_error ("Adding new name", list2 (file, newname));
+ {
+ int link_errno = errno;
+ report_file_errno ("Adding new name", list2 (file, newname), link_errno);
+ }
UNGCPRO;
return Qnil;
if (symlink (SSDATA (encoded_filename), SSDATA (encoded_linkname)) < 0)
{
/* If we didn't complain already, silently delete existing file. */
+ int symlink_errno;
if (errno == EEXIST)
{
unlink (SSDATA (encoded_linkname));
build_string ("Symbolic links are not supported"));
}
- report_file_error ("Making symbolic link", list2 (filename, linkname));
+ symlink_errno = errno;
+ report_file_errno ("Making symbolic link", list2 (filename, linkname),
+ symlink_errno);
}
UNGCPRO;
return Qnil;
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qfile_exists_p);
if (!NILP (handler))
- return call2 (handler, Qfile_exists_p, absname);
+ {
+ Lisp_Object result = call2 (handler, Qfile_exists_p, absname);
+ errno = 0;
+ return result;
+ }
absname = ENCODE_FILE (absname);
(Lisp_Object filename, Lisp_Object string)
{
Lisp_Object handler, encoded_filename, absname;
- int fd;
CHECK_STRING (filename);
absname = Fexpand_file_name (filename, Qnil);
encoded_filename = ENCODE_FILE (absname);
- fd = emacs_open (SSDATA (encoded_filename), O_RDONLY, 0);
- if (fd < 0)
- report_file_error (SSDATA (string), Fcons (filename, Qnil));
- emacs_close (fd);
+ if (faccessat (AT_FDCWD, SSDATA (encoded_filename), R_OK, AT_EACCESS) != 0)
+ report_file_error (SSDATA (string), filename);
return Qnil;
}
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qfile_accessible_directory_p);
if (!NILP (handler))
- return call2 (handler, Qfile_accessible_directory_p, absname);
+ {
+ Lisp_Object r = call2 (handler, Qfile_accessible_directory_p, absname);
+ errno = 0;
+ return r;
+ }
absname = ENCODE_FILE (absname);
return file_accessible_directory_p (SSDATA (absname)) ? Qt : Qnil;
and it's a safe optimization here. */
char *buf = SAFE_ALLOCA (len + 3);
memcpy (buf, file, len);
- strcpy (buf + len, "/." + (file[len - 1] == '/'));
+ strcpy (buf + len, &"/."[file[len - 1] == '/']);
dir = buf;
}
!= 0);
/* See http://debbugs.gnu.org/11245 for ENOTSUP. */
if (fail && errno != ENOTSUP)
- report_file_error ("Doing lsetfilecon", Fcons (absname, Qnil));
+ report_file_error ("Doing lsetfilecon", absname);
context_free (parsed_con);
freecon (con);
return fail ? Qnil : Qt;
}
else
- report_file_error ("Doing lgetfilecon", Fcons (absname, Qnil));
+ report_file_error ("Doing lgetfilecon", absname);
}
#endif
{
Lisp_Object absname;
Lisp_Object handler;
-#ifdef HAVE_POSIX_ACL
+#ifdef HAVE_ACL_SET_FILE
acl_t acl;
Lisp_Object acl_string;
char *str;
if (!NILP (handler))
return call2 (handler, Qfile_acl, absname);
-#ifdef HAVE_POSIX_ACL
+#ifdef HAVE_ACL_SET_FILE
absname = ENCODE_FILE (absname);
acl = acl_get_file (SSDATA (absname), ACL_TYPE_ACCESS);
{
Lisp_Object absname;
Lisp_Object handler;
-#ifdef HAVE_POSIX_ACL
+#ifdef HAVE_ACL_SET_FILE
Lisp_Object encoded_absname;
acl_t acl;
bool fail;
if (!NILP (handler))
return call3 (handler, Qset_file_acl, absname, acl_string);
-#ifdef HAVE_POSIX_ACL
+#ifdef HAVE_ACL_SET_FILE
if (STRINGP (acl_string))
{
acl = acl_from_text (SSDATA (acl_string));
if (acl == NULL)
{
- report_file_error ("Converting ACL", Fcons (absname, Qnil));
+ report_file_error ("Converting ACL", absname);
return Qnil;
}
fail = (acl_set_file (SSDATA (encoded_absname), ACL_TYPE_ACCESS,
acl)
!= 0);
- if (fail && errno != ENOTSUP)
- report_file_error ("Setting ACL", Fcons (absname, Qnil));
+ if (fail && acl_errno_valid (errno))
+ report_file_error ("Setting ACL", absname);
acl_free (acl);
return fail ? Qnil : Qt;
encoded_absname = ENCODE_FILE (absname);
if (chmod (SSDATA (encoded_absname), XINT (mode) & 07777) < 0)
- report_file_error ("Doing chmod", Fcons (absname, Qnil));
+ report_file_error ("Doing chmod", absname);
return Qnil;
}
if (file_directory_p (SSDATA (encoded_absname)))
return Qnil;
#endif
- report_file_error ("Setting file times", Fcons (absname, Qnil));
+ report_file_error ("Setting file times", absname);
}
}
if (stat (SSDATA (absname2), &st2) < 0)
return Qt;
- return (EMACS_TIME_GT (get_stat_mtime (&st1), get_stat_mtime (&st2))
+ return (EMACS_TIME_LT (get_stat_mtime (&st2), get_stat_mtime (&st1))
? Qt : Qnil);
}
\f
o remove all text properties.
o set back the buffer multibyteness. */
-static Lisp_Object
+static void
decide_coding_unwind (Lisp_Object unwind_data)
{
Lisp_Object multibyte, undo_list, buffer;
/* Now we are safe to change the buffer's multibyteness directly. */
bset_enable_multibyte_characters (current_buffer, multibyte);
bset_undo_list (current_buffer, undo_list);
-
- return Qnil;
}
/* Read from a non-regular file. STATE is a Lisp_Save_Value
EMACS_TIME mtime;
int fd;
ptrdiff_t inserted = 0;
- bool nochange = 0;
ptrdiff_t how_much;
off_t beg_offset, end_offset;
int unprocessed;
bool set_coding_system = 0;
Lisp_Object coding_system;
bool read_quit = 0;
+ /* If the undo log only contains the insertion, there's no point
+ keeping it. It's typically when we first fill a file-buffer. */
+ bool empty_undo_list_p
+ = (!NILP (visit) && NILP (BVAR (current_buffer, undo_list))
+ && BEG == Z);
Lisp_Object old_Vdeactivate_mark = Vdeactivate_mark;
bool we_locked_file = 0;
- bool deferred_remove_unwind_protect = 0;
+ ptrdiff_t fd_index;
if (current_buffer->base_buffer && ! NILP (visit))
error ("Cannot do file visiting in an indirect buffer");
{
save_errno = errno;
if (NILP (visit))
- report_file_error ("Opening input file", Fcons (orig_filename, Qnil));
+ report_file_error ("Opening input file", orig_filename);
mtime = time_error_value (save_errno);
st.st_size = -1;
if (!NILP (Vcoding_system_for_read))
goto notfound;
}
+ fd_index = SPECPDL_INDEX ();
+ record_unwind_protect_int (close_file_unwind, fd);
+
/* Replacement should preserve point as it preserves markers. */
if (!NILP (replace))
record_unwind_protect (restore_point_unwind, Fpoint_marker ());
- record_unwind_protect (close_file_unwind, make_number (fd));
-
if (fstat (fd, &st) != 0)
- report_file_error ("Input file status", Fcons (orig_filename, Qnil));
+ report_file_error ("Input file status", orig_filename);
mtime = get_stat_mtime (&st);
/* This code will need to be changed in order to work on named
int ntail;
if (lseek (fd, - (1024 * 3), SEEK_END) < 0)
report_file_error ("Setting file position",
- Fcons (orig_filename, Qnil));
+ orig_filename);
ntail = emacs_read (fd, read_buf + nread, 1024 * 3);
nread = ntail < 0 ? ntail : nread + ntail;
}
}
if (nread < 0)
- error ("IO error reading %s: %s",
- SDATA (orig_filename), emacs_strerror (errno));
+ report_file_error ("Read error", orig_filename);
else if (nread > 0)
{
struct buffer *prev = current_buffer;
/* Rewind the file for the actual read done later. */
if (lseek (fd, 0, SEEK_SET) < 0)
- report_file_error ("Setting file position",
- Fcons (orig_filename, Qnil));
+ report_file_error ("Setting file position", orig_filename);
}
}
if (beg_offset != 0)
{
if (lseek (fd, beg_offset, SEEK_SET) < 0)
- report_file_error ("Setting file position",
- Fcons (orig_filename, Qnil));
+ report_file_error ("Setting file position", orig_filename);
}
immediate_quit = 1;
nread = emacs_read (fd, read_buf, sizeof read_buf);
if (nread < 0)
- error ("IO error reading %s: %s",
- SSDATA (orig_filename), emacs_strerror (errno));
+ report_file_error ("Read error", orig_filename);
else if (nread == 0)
break;
if (same_at_start - BEGV_BYTE == end_offset - beg_offset)
{
emacs_close (fd);
- specpdl_ptr--;
+ clear_unwind_protect (fd_index);
+
/* Truncate the buffer to the size of the file. */
del_range_1 (same_at_start, same_at_end, 0, 0);
goto handled;
/* How much can we scan in the next step? */
trial = min (curpos, sizeof read_buf);
if (lseek (fd, curpos - trial, SEEK_SET) < 0)
- report_file_error ("Setting file position",
- Fcons (orig_filename, Qnil));
+ report_file_error ("Setting file position", orig_filename);
total_read = nread = 0;
while (total_read < trial)
{
nread = emacs_read (fd, read_buf + total_read, trial - total_read);
if (nread < 0)
- error ("IO error reading %s: %s",
- SDATA (orig_filename), emacs_strerror (errno));
+ report_file_error ("Read error", orig_filename);
else if (nread == 0)
break;
total_read += nread;
/* If display currently starts at beginning of line,
keep it that way. */
- if (XBUFFER (XWINDOW (selected_window)->buffer) == current_buffer)
+ if (XBUFFER (XWINDOW (selected_window)->contents) == current_buffer)
XWINDOW (selected_window)->start_at_line_beg = !NILP (Fbolp ());
replace_handled = 1;
CONVERSION_BUFFER. */
if (lseek (fd, beg_offset, SEEK_SET) < 0)
- report_file_error ("Setting file position",
- Fcons (orig_filename, Qnil));
+ report_file_error ("Setting file position", orig_filename);
inserted = 0; /* Bytes put into CONVERSION_BUFFER so far. */
unprocessed = 0; /* Bytes not processed in previous loop. */
memcpy (read_buf, coding.carryover, unprocessed);
}
UNGCPRO;
- emacs_close (fd);
-
- /* We should remove the unwind_protect calling
- close_file_unwind, but other stuff has been added the stack,
- so defer the removal till we reach the `handled' label. */
- deferred_remove_unwind_protect = 1;
-
if (this < 0)
- error ("IO error reading %s: %s",
- SDATA (orig_filename), emacs_strerror (errno));
+ report_file_error ("Read error", orig_filename);
+ emacs_close (fd);
+ clear_unwind_protect (fd_index);
if (unprocessed > 0)
{
if (bufpos == inserted)
{
/* Truncate the buffer to the size of the file. */
- if (same_at_start == same_at_end)
- nochange = 1;
- else
+ if (same_at_start != same_at_end)
del_range_byte (same_at_start, same_at_end, 0);
inserted = 0;
/* If display currently starts at beginning of line,
keep it that way. */
- if (XBUFFER (XWINDOW (selected_window)->buffer) == current_buffer)
+ if (XBUFFER (XWINDOW (selected_window)->contents) == current_buffer)
XWINDOW (selected_window)->start_at_line_beg = !NILP (Fbolp ());
/* Replace the chars that we need to replace,
{
del_range_byte (same_at_start, same_at_end, 0);
temp = GPT;
+ eassert (same_at_start == GPT_BYTE);
same_at_start = GPT_BYTE;
}
else
= buf_bytepos_to_charpos (XBUFFER (conversion_buffer),
same_at_start - BEGV_BYTE
+ BUF_BEG_BYTE (XBUFFER (conversion_buffer)));
+ eassert (same_at_start_charpos == temp - (BEGV - BEG));
inserted_chars
= (buf_bytepos_to_charpos (XBUFFER (conversion_buffer),
same_at_start + inserted - BEGV_BYTE
if (beg_offset != 0 || !NILP (replace))
{
if (lseek (fd, beg_offset, SEEK_SET) < 0)
- report_file_error ("Setting file position",
- Fcons (orig_filename, Qnil));
+ report_file_error ("Setting file position", orig_filename);
}
/* In the following loop, HOW_MUCH contains the total bytes read so
to be signaled after decoding the text we read. */
nbytes = internal_condition_case_1
(read_non_regular,
- make_save_value ("iii", (ptrdiff_t) fd, inserted, trytry),
+ make_save_int_int_int (fd, inserted, trytry),
Qerror, read_non_regular_quit);
if (NILP (nbytes))
Vdeactivate_mark = Qt;
emacs_close (fd);
-
- /* Discard the unwind protect for closing the file. */
- specpdl_ptr--;
+ clear_unwind_protect (fd_index);
if (how_much < 0)
- error ("IO error reading %s: %s",
- SDATA (orig_filename), emacs_strerror (errno));
+ report_file_error ("Read error", orig_filename);
/* Make the text read part of the buffer. */
GAP_SIZE -= inserted;
handled:
- if (deferred_remove_unwind_protect)
- /* If requested above, discard the unwind protect for closing the
- file. */
- specpdl_ptr--;
-
if (!NILP (visit))
{
- if (!EQ (BVAR (current_buffer, undo_list), Qt) && !nochange)
+ if (empty_undo_list_p)
bset_undo_list (current_buffer, Qnil);
if (NILP (handler))
p = XCDR (p);
}
- if (NILP (visit))
+ if (!empty_undo_list_p)
{
bset_undo_list (current_buffer, old_undo);
if (CONSP (old_undo) && inserted != old_inserted)
&& EMACS_NSECS (current_buffer->modtime) == NONEXISTENT_MODTIME_NSECS)
{
/* If visiting nonexistent file, return nil. */
- errno = save_errno;
- report_file_error ("Opening input file", Fcons (orig_filename, Qnil));
+ report_file_errno ("Opening input file", orig_filename, save_errno);
}
if (read_quit)
\f
static Lisp_Object build_annotations (Lisp_Object, Lisp_Object);
-static Lisp_Object
+static void
build_annotations_unwind (Lisp_Object arg)
{
Vwrite_region_annotation_buffers = arg;
- return Qnil;
}
/* Decide the coding-system to encode the data with. */
&& !NILP (Ffboundp (Vselect_safe_coding_system_function)))
/* Confirm that VAL can surely encode the current region. */
val = call5 (Vselect_safe_coding_system_function,
- start, end, Fcons (Qt, Fcons (val, Qnil)),
+ start, end, list2 (Qt, val),
Qnil, filename);
}
else
This calls `write-region-annotate-functions' at the start, and
`write-region-post-annotation-function' at the end. */)
- (Lisp_Object start, Lisp_Object end, Lisp_Object filename, Lisp_Object append, Lisp_Object visit, Lisp_Object lockname, Lisp_Object mustbenew)
+ (Lisp_Object start, Lisp_Object end, Lisp_Object filename, Lisp_Object append,
+ Lisp_Object visit, Lisp_Object lockname, Lisp_Object mustbenew)
+{
+ return write_region (start, end, filename, append, visit, lockname, mustbenew,
+ -1);
+}
+
+/* Like Fwrite_region, except that if DESC is nonnegative, it is a file
+ descriptor for FILENAME, so do not open or close FILENAME. */
+
+Lisp_Object
+write_region (Lisp_Object start, Lisp_Object end, Lisp_Object filename,
+ Lisp_Object append, Lisp_Object visit, Lisp_Object lockname,
+ Lisp_Object mustbenew, int desc)
{
- int desc;
int open_flags;
int mode;
off_t offset IF_LINT (= 0);
+ bool open_and_close_file = desc < 0;
bool ok;
int save_errno = 0;
const char *fn;
struct stat st;
EMACS_TIME modtime;
ptrdiff_t count = SPECPDL_INDEX ();
- int count1;
+ ptrdiff_t count1 IF_LINT (= 0);
Lisp_Object handler;
Lisp_Object visit_file;
Lisp_Object annotations;
Lisp_Object encoded_filename;
bool visiting = (EQ (visit, Qt) || STRINGP (visit));
bool quietly = !NILP (visit);
+ bool file_locked = 0;
struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5;
struct buffer *given_buffer;
struct coding_system coding;
record_unwind_protect (build_annotations_unwind,
Vwrite_region_annotation_buffers);
- Vwrite_region_annotation_buffers = Fcons (Fcurrent_buffer (), Qnil);
- count1 = SPECPDL_INDEX ();
+ Vwrite_region_annotation_buffers = list1 (Fcurrent_buffer ());
given_buffer = current_buffer;
coding.mode |= CODING_MODE_SELECTIVE_DISPLAY;
#ifdef CLASH_DETECTION
- if (!auto_saving)
- lock_file (lockname);
+ if (open_and_close_file && !auto_saving)
+ {
+ lock_file (lockname);
+ file_locked = 1;
+ }
#endif /* CLASH_DETECTION */
encoded_filename = ENCODE_FILE (filename);
mode = auto_saving ? auto_save_mode_bits : 0666;
#endif
- desc = emacs_open (fn, open_flags, mode);
-
- if (desc < 0)
+ if (open_and_close_file)
{
+ desc = emacs_open (fn, open_flags, mode);
+ if (desc < 0)
+ {
+ int open_errno = errno;
#ifdef CLASH_DETECTION
- save_errno = errno;
- if (!auto_saving) unlock_file (lockname);
- errno = save_errno;
+ if (file_locked)
+ unlock_file (lockname);
#endif /* CLASH_DETECTION */
- UNGCPRO;
- report_file_error ("Opening output file", Fcons (filename, Qnil));
- }
+ UNGCPRO;
+ report_file_errno ("Opening output file", filename, open_errno);
+ }
- record_unwind_protect (close_file_unwind, make_number (desc));
+ count1 = SPECPDL_INDEX ();
+ record_unwind_protect_int (close_file_unwind, desc);
+ }
if (NUMBERP (append))
{
off_t ret = lseek (desc, offset, SEEK_SET);
if (ret < 0)
{
+ int lseek_errno = errno;
#ifdef CLASH_DETECTION
- save_errno = errno;
- if (!auto_saving) unlock_file (lockname);
- errno = save_errno;
+ if (file_locked)
+ unlock_file (lockname);
#endif /* CLASH_DETECTION */
UNGCPRO;
- report_file_error ("Lseek error", Fcons (filename, Qnil));
+ report_file_errno ("Lseek error", filename, lseek_errno);
}
}
immediate_quit = 0;
- /* fsync appears to change the modtime on BSD4.2.
- Disk full in NFS may be reported here. */
- /* mib says that closing the file will try to write as fast as NFS can do
- it, and that means the fsync here is not crucial for autosave files. */
- if (!auto_saving && !write_region_inhibit_fsync)
+ /* fsync is not crucial for temporary files. Nor for auto-save
+ files, since they might lose some work anyway. */
+ if (open_and_close_file && !auto_saving && !write_region_inhibit_fsync)
{
- /* Transfer data and metadata to disk, retrying if interrupted. Also,
- ignore EINVAL which happens when fsync is not supported on this
- file. */
+ /* Transfer data and metadata to disk, retrying if interrupted.
+ fsync can report a write failure here, e.g., due to disk full
+ under NFS. But ignore EINVAL, which means fsync is not
+ supported on this file. */
while (fsync (desc) != 0)
if (errno != EINTR)
{
ok = 0, save_errno = errno;
}
- /* NFS can report a write failure now. */
- if (emacs_close (desc) < 0)
- ok = 0, save_errno = errno;
+ if (open_and_close_file)
+ {
+ /* NFS can report a write failure now. */
+ if (emacs_close (desc) < 0)
+ ok = 0, save_errno = errno;
- /* Discard the unwind protect for close_file_unwind. */
- specpdl_ptr = specpdl + count1;
+ /* Discard the unwind protect for close_file_unwind. */
+ specpdl_ptr = specpdl + count1;
+ }
/* Some file systems have a bug where st_mtime is not updated
properly after a write. For example, CIFS might not see the
&& ! (valid_timestamp_file_system && st.st_dev == timestamp_file_system))
{
int desc1 = emacs_open (fn, O_WRONLY | O_BINARY, 0);
- if (0 <= desc1)
+ if (desc1 >= 0)
{
struct stat st1;
if (fstat (desc1, &st1) == 0
unbind_to (count, Qnil);
#ifdef CLASH_DETECTION
- if (!auto_saving)
+ if (file_locked)
unlock_file (lockname);
#endif /* CLASH_DETECTION */
}
if (! ok)
- error ("IO error writing %s: %s", SDATA (filename),
- emacs_strerror (save_errno));
+ report_file_errno ("Write error", filename, save_errno);
if (visiting)
{
return Qnil;
}
\f
-Lisp_Object merge (Lisp_Object, Lisp_Object, Lisp_Object);
-
DEFUN ("car-less-than-car", Fcar_less_than_car, Scar_less_than_car, 2, 2, 0,
doc: /* Return t if (car A) is numerically less than (car B). */)
(Lisp_Object a, Lisp_Object b)
if (coding->produced > 0)
{
- coding->produced
- -= emacs_write (desc,
- STRINGP (coding->dst_object)
- ? SSDATA (coding->dst_object)
- : (char *) BYTE_POS_ADDR (coding->dst_pos_byte),
- coding->produced);
+ char *buf = (STRINGP (coding->dst_object)
+ ? SSDATA (coding->dst_object)
+ : (char *) BYTE_POS_ADDR (coding->dst_pos_byte));
+ coding->produced -= emacs_write_sig (desc, buf, coding->produced);
if (coding->produced)
return 0;
return Qnil;
}
-DEFUN ("clear-visited-file-modtime", Fclear_visited_file_modtime,
- Sclear_visited_file_modtime, 0, 0, 0,
- doc: /* Clear out records of last mod time of visited file.
-Next attempt to save will certainly not complain of a discrepancy. */)
- (void)
-{
- current_buffer->modtime = make_emacs_time (0, UNKNOWN_MODTIME_NSECS);
- current_buffer->modtime_size = -1;
- return Qnil;
-}
-
DEFUN ("visited-file-modtime", Fvisited_file_modtime,
Svisited_file_modtime, 0, 0, 0,
doc: /* Return the current buffer's recorded visited file modification time.
The value is a list of the form (HIGH LOW USEC PSEC), like the time values that
`file-attributes' returns. If the current buffer has no recorded file
modification time, this function returns 0. If the visited file
-doesn't exist, HIGH will be -1.
+doesn't exist, return -1.
See Info node `(elisp)Modification Time' for more details. */)
(void)
{
- if (EMACS_NSECS (current_buffer->modtime) < 0)
- {
- if (EMACS_NSECS (current_buffer->modtime) == NONEXISTENT_MODTIME_NSECS)
- {
- /* make_lisp_time won't work here if time_t is unsigned. */
- return list4i (-1, 65535, 0, 0);
- }
- return make_number (0);
- }
+ int ns = EMACS_NSECS (current_buffer->modtime);
+ if (ns < 0)
+ return make_number (UNKNOWN_MODTIME_NSECS - ns);
return make_lisp_time (current_buffer->modtime);
}
or if the file itself has been changed for some known benign reason.
An argument specifies the modification time value to use
\(instead of that of the visited file), in the form of a list
-\(HIGH LOW USEC PSEC) as returned by `current-time'. */)
- (Lisp_Object time_list)
+\(HIGH LOW USEC PSEC) or an integer flag as returned by
+`visited-file-modtime'. */)
+ (Lisp_Object time_flag)
{
- if (!NILP (time_list))
+ if (!NILP (time_flag))
{
- current_buffer->modtime = lisp_time_argument (time_list);
+ EMACS_TIME mtime;
+ if (INTEGERP (time_flag))
+ {
+ CHECK_RANGED_INTEGER (time_flag, -1, 0);
+ mtime = make_emacs_time (0, UNKNOWN_MODTIME_NSECS - XINT (time_flag));
+ }
+ else
+ mtime = lisp_time_argument (time_flag);
+
+ current_buffer->modtime = mtime;
current_buffer->modtime_size = -1;
}
else
Qnil, Qnil);
}
-static Lisp_Object
-do_auto_save_unwind (Lisp_Object arg) /* used as unwind-protect function */
+struct auto_save_unwind
+{
+ FILE *stream;
+ bool auto_raise;
+};
+static void
+do_auto_save_unwind (void *arg)
{
- FILE *stream = XSAVE_POINTER (arg, 0);
+ struct auto_save_unwind *p = arg;
+ FILE *stream = p->stream;
+ minibuffer_auto_raise = p->auto_raise;
auto_saving = 0;
if (stream != NULL)
{
fclose (stream);
unblock_input ();
}
- return Qnil;
-}
-
-static Lisp_Object
-do_auto_save_unwind_1 (Lisp_Object value) /* used as unwind-protect function */
-
-{
- minibuffer_auto_raise = XINT (value);
- return Qnil;
}
static Lisp_Object
ptrdiff_t count = SPECPDL_INDEX ();
bool orig_minibuffer_auto_raise = minibuffer_auto_raise;
bool old_message_p = 0;
+ struct auto_save_unwind auto_save_unwind;
struct gcpro gcpro1, gcpro2;
if (max_specpdl_size < specpdl_size + 40)
if (NILP (no_message))
{
old_message_p = push_message ();
- record_unwind_protect (pop_message_unwind, Qnil);
+ record_unwind_protect_void (pop_message_unwind);
}
/* Ordinarily don't quit within this function,
point to non-strings reached from Vbuffer_alist. */
hook = intern ("auto-save-hook");
- Frun_hooks (1, &hook);
+ safe_run_hooks (hook);
if (STRINGP (Vauto_save_list_file_name))
{
UNGCPRO;
}
- stream = fopen (SSDATA (listfile), "w");
+ stream = emacs_fopen (SSDATA (listfile), "w");
}
- record_unwind_protect (do_auto_save_unwind,
- make_save_pointer (stream));
- record_unwind_protect (do_auto_save_unwind_1,
- make_number (minibuffer_auto_raise));
+ auto_save_unwind.stream = stream;
+ auto_save_unwind.auto_raise = minibuffer_auto_raise;
+ record_unwind_protect_ptr (do_auto_save_unwind, &auto_save_unwind);
minibuffer_auto_raise = 0;
auto_saving = 1;
auto_save_error_occurred = 0;
couldn't handle some ange-ftp'd file. */
for (do_handled_files = 0; do_handled_files < 2; do_handled_files++)
- for (tail = Vbuffer_alist; CONSP (tail); tail = XCDR (tail))
+ FOR_EACH_LIVE_BUFFER (tail, buf)
{
- buf = XCDR (XCAR (tail));
b = XBUFFER (buf);
/* Record all the buffers that have auto save mode
if ((NILP (last_nonmenu_event) || CONSP (last_nonmenu_event))
&& use_dialog_box
&& use_file_dialog
- && have_menus_p ())
+ && window_system_available (SELECTED_FRAME ()))
return Qt;
#endif
return Qnil;
DEFSYM (Qfile_error, "file-error");
DEFSYM (Qfile_already_exists, "file-already-exists");
DEFSYM (Qfile_date_error, "file-date-error");
+ DEFSYM (Qfile_notify_error, "file-notify-error");
DEFSYM (Qexcl, "excl");
DEFVAR_LISP ("file-name-coding-system", Vfile_name_coding_system,
Fput (Qfile_date_error, Qerror_message,
build_pure_c_string ("Cannot set file date"));
+ Fput (Qfile_notify_error, Qerror_conditions,
+ Fpurecopy (list3 (Qfile_notify_error, Qfile_error, Qerror)));
+ Fput (Qfile_notify_error, Qerror_message,
+ build_pure_c_string ("File notification error"));
+
DEFVAR_LISP ("file-name-handler-alist", Vfile_name_handler_alist,
doc: /* Alist of elements (REGEXP . HANDLER) for file names handled specially.
If a file name matches REGEXP, all I/O on that file is done by calling
file is usually more useful if it contains the deleted text. */);
Vauto_save_include_big_deletions = Qnil;
+ /* fsync can be a significant performance hit. Often it doesn't
+ suffice to make the file-save operation survive a crash. For
+ batch scripts, which are typically part of larger shell commands
+ that don't fsync other files, its effect on performance can be
+ significant so its utility is particularly questionable.
+ Hence, for now by default fsync is used only when interactive.
+
+ For more on why fsync often fails to work on today's hardware, see:
+ Zheng M et al. Understanding the robustness of SSDs under power fault.
+ 11th USENIX Conf. on File and Storage Technologies, 2013 (FAST '13), 271-84
+ http://www.usenix.org/system/files/conference/fast13/fast13-final80.pdf
+
+ For more on why fsync does not suffice even if it works properly, see:
+ Roche X. Necessary step(s) to synchronize filename operations on disk.
+ Austin Group Defect 672, 2013-03-19
+ http://austingroupbugs.net/view.php?id=672 */
DEFVAR_BOOL ("write-region-inhibit-fsync", write_region_inhibit_fsync,
doc: /* Non-nil means don't call fsync in `write-region'.
This variable affects calls to `write-region' as well as save commands.
-A non-nil value may result in data loss! */);
- write_region_inhibit_fsync = 0;
+Setting this to nil may avoid data loss if the system loses power or
+the operating system crashes. */);
+ write_region_inhibit_fsync = noninteractive;
DEFVAR_BOOL ("delete-by-moving-to-trash", delete_by_moving_to_trash,
doc: /* Specifies whether to use the system's trash can.
defsubr (&Swrite_region);
defsubr (&Scar_less_than_car);
defsubr (&Sverify_visited_file_modtime);
- defsubr (&Sclear_visited_file_modtime);
defsubr (&Svisited_file_modtime);
defsubr (&Sset_visited_file_modtime);
defsubr (&Sdo_auto_save);